Question

What mass (in grams) of sodium chloride, NaCl, is needed to make 422. g of a 3.39%(m/m) NaCl solution?
(atomic masses: Na = 22.99, Cl = 35.45)

Answer 1

[(x grams solute/(grams solution)]*100 = %
Solve for grams solute.

Answer 2

442 g * 0.0339 = 14.98 g

Answer 3

I think you mis-read the problem. mass of the solution is 422g and not 442; otherwise, your procedure is ok.